CVE-2026-340026.1MediumCWE-805

CVE-2026-34002: Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling

Red Hat · Red Hat Enterprise Linux 10.0 Extended Update Support

Vendor fix available · Affected: Red Hat Enterprise Linux 10.0 Extended Update Support · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.5%probability of exploitation in the next 30 days

42nd percentile

050100

Higher than 42% of scored CVEs

6.1MediumCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.

Affected products20

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Red Hat · Red Hat Enterprise Linux 10.0 Extended Update SupportVersions not stated
Red Hat · Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONVersions not stated
Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle SupportVersions not stated
Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle SupportVersions not stated
Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportVersions not stated
Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportVersions not stated
Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnVersions not stated
Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnVersions not stated
Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportVersions not stated
Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportVersions not stated
Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportVersions not stated
Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnVersions not stated
Red Hat · Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceVersions not stated
Red Hat · Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceVersions not stated
Red Hat · Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsVersions not stated
Red Hat · Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsVersions not stated
Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceVersions not stated
Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceVersions not stated
Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceVersions not stated
Red Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsVersions not stated

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Buffer Access with Incorrect Length Value · Memory Corruption
Vendor: Red Hat
Published: May 2026
Band: Unlikely (under 1%), May 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-34002 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.

References

14 more references are in the CVE record.